Figure 1.
The two sample sites Site 1 (Pingliang) and Site 2 (Xi’an) along nature gas pipelines right-of-way and sample plots that were set up at seven different distances from the pipeline.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.